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CVE-2009-1959

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13...

5.0 MediumPublic exploitFix available

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.

Exploit likelihood

8.38%Down 4.2 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 5.0

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.

Record
CVE-2009-1959
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-189
Updated
2026-11-02
CVE List No score

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.

Record
CVE-2009-1959
Updated
2026-11-02
EUVDEUVD-2009-1954 No score

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.

Record
EUVD-2009-1954
Updated
2026-11-03
GitHub AdvisoriesGHSA-2v73-9rwq-75qc No score

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13...

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.

Record
GHSA-2v73-9rwq-75qc
Updated
2026-11-02
OSV No score

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.

Record
CVE-2009-1959
Updated
2026-11-02
OSVDEBIAN-CVE-2009-1959 No score

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.

Record
DEBIAN-CVE-2009-1959
Updated
2026-11-02
OSVopenSUSE-SU-2024:10455-1 No score

irssi-0.8.20-3.1 on GA media

These are all security issues fixed in the irssi-0.8.20-3.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10455-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
irssi
Debian:12
 before 0.8.13-2
0.8.13-2
irssi
Debian:13
 before 0.8.13-2
0.8.13-2
irssi
Debian:14
 before 0.8.13-2
0.8.13-2
irssi
openSUSE:Tumbleweed
From an advisory covering 6 CVEs
 before 0.8.20-3.1
0.8.20-3.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
Exploit-DBIrssi 0.8.13 - 'WALLOPS' Message Off-by-One Heap Memory Corruption2009-05-15

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, Exploit-DB, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2009-1959 is a medium vulnerability (CVSS 5.0) in Irssi, published June 6, 2009. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 8.38%, the 95th percentile. Fixed in irssi 0.8.13-2.

References

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